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Emulsion Polymerization of Octamethylcyclotetrasiloxane under Ultrasonic Irradiation  

Kim, Jihye (Department of Chemical Engineering, Dankook University)
Kim, Yubin (Department of Chemical Engineering, Dankook University)
Kim, Hyungsu (Department of Chemical Engineering, Dankook University)
Publication Information
Applied Chemistry for Engineering / v.20, no.3, 2009 , pp. 322-328 More about this Journal
Abstract
Emulsion polymerization of octamethylcyclotetrasiloxane (OMCTS) was conducted under ultrasonic irradiation. Two sources of ultrasound with different intensities and frequencies of 20 KHz and 40 KHz were used for horn and bath type reactor, respectively. A combined process of horn and bath was also investigated. The effectiveness of the reaction systems was investigated by measuring conversion as well as intrinsic viscosity of the products. The influence of reaction temperature and sonication time on the progress of sonochemical polymerization was examined. It was found that conversion of greater than 80% and high viscosity were achieved within a few minutes of sonication in a horn type reactor, however, conversion and viscosity showed maximum values depending upon the sonication time. In a bath type reactor where a relatively weak intensity was maintained, longer duration time of more than one hour of sonication was required to reach a high level of conversion and viscosity. Compared with the horn type system, the conversion and viscosity in the bath type reactor were increased along with the sonication time. When the polymerization was carried out in a combined system of horn and bath, the evolution of conversion and molecular weight was quite different from the other cases. For the given geometry of reaction system, acoustic analysis using a commercial software was carried out and the results were correlated with experimental observation.
Keywords
octamethylcyclotetrasiloxane; polydimethylsiloxane; ultrasound; emulsion polymerization; ring opening polymerization;
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